Date: Tue, 29 Apr 1997 10:03:57 +0200 (SAT) From: John Hay <jhay@zibbi.mikom.csir.co.za> To: dg@root.com Cc: freebsd-stable@freebsd.org Subject: Re: Memory usage on NFS server Message-ID: <199704290803.KAA18509@zibbi.mikom.csir.co.za> In-Reply-To: <199704290720.AAA11888@implode.root.com> from David Greenman at "Apr 29, 97 00:20:09 am"
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> > 2.2-970420-RELENG on an NFS server that does only that. The ~20 > >processes normally running on the machine add up to less than 10MB, > >yes `top' reports that 78MB is "active". I would have though most of > >the memory would be allocated as cache (which is only reported at > >25MB). Am I interpreting the numbers incorrectly? > ... > >Mem: 78M Active, 4984K Inact, 17M Wired, 25M Cache, 8343K Buf, 616K Free > > The numbers lie; don't believe them. :-) It's not as simple as looking > at the "cache" number - pages in "active" and "inactive" are also part of > the file cache. I know this makes it very difficult to see how much memory > is actually available for caching...I have the same problem on wcarchive. > We need to provide an additional metric, but I don't know at the moment > how to create the desired information (it's difficult and perhaps impossible > in the current architecture). > Do the numbers that top and ps show for per process memory usage also lie? What I see here on my news server, is that I run out of swap (256M), but according to top and ps a rough calculation of the total of all the processes is less than half that. Inn then typically show a usage of ~70M according to top, but as soon as I kill and restart it the swap usage go down to ~5M. I once even added a 128M vn swapfile and it filled that also without inn showing a usage of more than 70M, but killing and restarting it takes the swap usage down to ~5M. John -- John Hay -- John.Hay@mikom.csir.co.za
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